EP 0039836 A3 19820519 - A SCANNING HEAD FOR AN OPTICAL DISC SYSTEM
Title (en)
A SCANNING HEAD FOR AN OPTICAL DISC SYSTEM
Publication
Application
Priority
- CA 351721 A 19800512
- US 14976580 A 19800514
Abstract (en)
[origin: US4337531A] In a scanning head for an optical disc system, a light beam from a laser is transmitted through a monomode optical fiber and then focussed on a record carrying surface of an optical disc by a converging lens. The end of the fiber can be reoriented within orthogonal planes perpendicular to the plane of the record carrying surface by transducers so as to correct for tracking and timing errors. The laser diode can function both as an emitter and, in an external cavity mode, as a detector of light reflected from the disc. Drive to the transducers is dependent on tracking and speed error signals generated from the detected light. For tracking and speed error compensation, only lens fiber end, and, optionally, a collimating lens, which are of negligible weight, need be moved rather than the entire scanning head. This provides a simple structure having a high frequency response and low power consumption.
IPC 1-7
IPC 8 full level
G02B 26/10 (2006.01); G11B 7/09 (2006.01); G11B 7/12 (2006.01); G11B 7/123 (2012.01); G11B 7/13 (2012.01); G11B 7/135 (2006.01); G11B 7/1384 (2012.01)
CPC (source: EP US)
G11B 7/0937 (2013.01 - EP US); G11B 7/123 (2013.01 - EP US); G11B 7/13 (2013.01 - EP US); G11B 7/1384 (2013.01 - EP US); G11B 7/0901 (2013.01 - EP US); G11B 7/0909 (2013.01 - EP US)
Citation (search report)
- JP S54135505 A 19791020 - TOKYO SHIBAURA ELECTRIC CO
- JP S5470002 A 19790605 - TOKYO SHIBAURA ELECTRIC CO
- JP S5470004 A 19790605 - TOKYO SHIBAURA ELECTRIC CO
- JP S54146612 A 19791116 - OLYMPUS OPTICAL CO
- JP S5470003 A 19790605 - TOKYO SHIBAURA ELECTRIC CO
- FR 2437043 A1 19800418 - PHILIPS NV [NL]
- GB 2027948 A 19800227 - UNIVERSAL PIONEER CORP
- DE 2935249 A1 19800313 - UNIVERSAL PIONEER CORP
- US 4135206 A 19790116 - KLEUTERS WILHELM J, et al
- PATENT ABSTRACTS OF JAPAN Vol. 3, No. 92, 4 August 1979 page 62E128 & JP - A - 54 - 70002
- PATENT ABSTRACTS OF JAPAN Vol. 3, No. 92, 4 August 1979 page 63E128 & JP - A - 54 - 70004
- PATENT ABSTRACTS OF JAPAN Vol. 3, No. 92, 4 August 1979 page 63E128 & JP - A -54 - 70003
- PATENT ABSTRACTS OF JAPAN Vol. 4, No. 5, 16 January 1980 page 96E165 & JP - A - 54 - 146612
- PATENT ABSTRACTS OF JAPAN Vol. 3, No. 155, 19 December 1979 page 69E160 & JP - A - 54 - 135505
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 4337531 A 19820629; CA 1132258 A 19820921; EP 0039836 A2 19811118; EP 0039836 A3 19820519; JP S573237 A 19820108
DOCDB simple family (application)
US 14976580 A 19800514; CA 351721 A 19800512; EP 81103226 A 19810429; JP 7026681 A 19810512